DC power supply



FIG. 1 is a front view of a DC power supply showing my new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof; and,

FIG. 7 is a perspective view thereof.

The cord is shown broken away throughout the views to indicate an indeterminate length. 

The ornamental design for a DC power supply, as shown and described. 